Process for securing and for checking the integrity of the secur

Details Process for securing and for checking the integrity of the secur Process for securing and for checking the integrity of the secur

1992-03-20

1993-06-29

Buczinski, Stephen C.

Cryptography

Cryptanalysis

380 28, H04L 900, H04K 100

Patent

active

052241602

ABSTRACT:
For securing programs contained in a system storage and for checking their integrity, the programs are in each case coded by a symmetric cryptographic algorithm with the application of a readback secured, secret key, and a check number for each program is simultaneously formed and stored in the storage of the system. For checking the integrity, the programs are then coded again in the same manner and the check number thus obtained in each case is compared with the check number stored at the first coding. It is possible to derive from the result of comparison a criteria for activation or locking the following programs.

REFERENCES:
patent: 4120030 (1978-10-01), Johnstone
patent: 4433207 (1984-02-01), Best
patent: 4471163 (1984-09-01), Donald et al.
patent: 4609777 (1986-09-01), Cargile
patent: 4683553 (1987-07-01), Mollier
patent: 4740890 (1988-04-01), William
G. Kafka, Elektronik, Jun. 1984, p. 159.

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